A cargo subcommand to generate platform-specific BUILD files.
Also, a bazel ruleset for using the outputs of that cargo subcommand.
You like cargo's package rich ecosystem, but are interested in using Bazel to build a multilanguage, large, or otherwise complex set of applications.
So far you've either stuck with Cargo and made do with build.rs files, or migrated to Bazel and avoided crates.io dependencies or manually generated a select set of BUILD files for vendored dependencies.
cargo raze gives you the best of both worlds: rust library downloading + resolution courtesy of Cargo with the power and scalability of Bazel.
In your Bazel WORKSPACE: ```python gitrepository( name = "iobazelrulesraze", remote = "https://github.com/acmcarther/cargo-raze.git", commit = "c84e361" )
gitrepository( name = "iobazelrulesrust", remote = "https://github.com/acmcarther/rulesrust.git", commit = "49a7345" ) load("@iobazelrulesrust//rust:rust.bzl", "rust_repositories")
rust_repositories() ```
Then, in a directory containing 'Cargo.toml'. Project root is fine:
cargo install cargo-vendor
cargo install cargo-raze
cargo generate_lockfile
cargo vendor -x
cargo raze "//path/to/vendor"
You dependencies each get a shiny new Cargo.bzl file that bazel can use to link your dependencies up. You will also get starter BUILD files that reference those .bzl files.
See the example for further details.
See my hobby project space_coop for a real life example.
This repo is a hybrid cargo crate + Bazel Skylark ruleset. The project is structured roughly as follows:
cargo-raze crate: - ./Cargo.toml - ./Cargo.lock - ./src/
rules_raze: - ./WORKSPACE - ./examples/ - ./raze/
Cargo.bzl. I envision mapping the existing platform-specific dependency support down to a handful of supported platforms within the bazel rule, rather than here. That lets us use bazel's select construct to support multiple platforms with a single rule.